Module execution_history 

Execution history facade for ETA estimation and persistence.

Responsibilities:

• Re-export execution history data models, storage helpers, and averaging logic.
• Keep persistence and weighted-estimation concerns split into focused companions.

Not handled here:

• Real-time progress tracking.
• UI or CLI ETA presentation.

Invariants/assumptions:

• Public re-exports preserve the existing crate::execution_history::* API surface.
• Persistence stays compatible with .ralph/cache/execution_history.json.

Structs

ExecutionEntry

A single execution entry recording phase durations.

ExecutionHistory

Root execution history data structure.

Functions

get_phase_averages

Get historical average durations for all phases.

load_execution_history

Load execution history from cache directory.

record_execution

Record a completed execution to history.

save_execution_history

Save execution history to cache directory.

weighted_average_duration

Calculate weighted average duration for a specific phase.